I do it every day. If I ride, come home, and then go out again, I don't check the pressure, but if the bike's sat overnight, I do. I *always* need to add air. I finally got a great floor pump with a gauge (the famous "pink pump")--it's so easy! For years I was going to the gas station maybe once a week. My other bike does have fatter tires, so probably doesn't lose pressure as quickly, but I'm sure I was riding around underinflated quite often.